[openssl.org #1650] signature length in ECDSA - Openssl

This is a discussion on [openssl.org #1650] signature length in ECDSA - Openssl ; Hi,
I try to understand why the signature length is variable in ECDSA.
Normally with 160bits EC, it must be 46 bytes long: 20 bytes for each of
the 2 components and 4 + 2 bytes for ASN.1.
I think ...